Endoanal ultrasonographic assessment after lateral internal sphincterotomy for chronic anal fissure: protocol for a prospective longitudinal cohort study.
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Chronic anal fissure is a painful tear in the lining of the anal canal that may not heal with medication or other non-surgical treatments. Lateral internal sphincterotomy is a commonly used surgical treatment. However, the amount of internal anal sphincter muscle divided during s…
Sponsor: Hospital Clínico Universitario de Valencia
Last updated Sep 09, 2026 17:00 UTC